函数逻辑报告

Linux Kernel

v5.5.9

Brick Technologies Co., Ltd

Source Code:block\bfq-iosched.c Create Date:2022-07-27 19:30:30
Last Modify:2020-03-12 14:18:49 Copyright©Brick
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函数名称：bfq_update_bfqq_wr_on_rq_arrival

函数原型：static void bfq_update_bfqq_wr_on_rq_arrival(struct bfq_data *bfqd, struct bfq_queue *bfqq, unsigned int old_wr_coeff, bool wr_or_deserves_wr, bool interactive, bool in_burst, bool soft_rt)

返回类型：void

参数：

类型参数名称
struct bfq_data *bfqd
struct bfq_queue *bfqq
unsigned intold_wr_coeff
boolwr_or_deserves_wr
boolinteractive
boolin_burst
boolsoft_rt
1522  如果old_wr_coeff恒等于1且wr_or_deserves_wr则
1524  如果interactive则
1525  Cumulative service received from the @bfq_queue since its* last transition to weight-raised state.等于0
1526  actor by which the weight of this queue is multiplied 等于* Maximum factor by which the weight of a weight-raised queue * is multiplied.
1527  current maximum weight-raising time for this queue 等于bfq_wr_duration(bfqd)
1528  否则
1540  Value of wr start time when switching to soft rt等于Return the farthest past time instant according to jiffies* macros.
1542  actor by which the weight of this queue is multiplied 等于* Maximum factor by which the weight of a weight-raised queue * is multiplied.乘Soft real-time applications are extremely more latency sensitive* than interactive ones. Over-raise the weight of the former to* privilege them against the latter.
1544  current maximum weight-raising time for this queue 等于 Maximum weight-raising duration for soft real-time processes
1557  budget, used also to calculate F_i: F_i = S_i + @budget / @weight 等于min_t - return minimum of two values, using the specified type*@type: data type to use*@x: first value*@y: second value(unsignedlong, budget, used also to calculate F_i: F_i = S_i + @budget / @weight , 2 * Return min budget, which is a fraction of the current or default* max budget (trying with 1/32))
1560  否则如果old_wr_coeff大于1则
1561  如果interactive则
1562  actor by which the weight of this queue is multiplied 等于* Maximum factor by which the weight of a weight-raised queue * is multiplied.
1563  current maximum weight-raising time for this queue 等于bfq_wr_duration(bfqd)
1564  否则如果in_burst则actor by which the weight of this queue is multiplied 等于1
1566  否则如果soft_rt则
1596  如果current maximum weight-raising time for this queue 不等于 Maximum weight-raising duration for soft real-time processes 则
1606  Start time of the current weight-raising period if* the @bfq-queue is being weight-raised, otherwise* finish time of the last weight-raising period.等于jiffies
调用者
名称描述
bfq_bfqq_handle_idle_busy_switch